<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>2_受控组件</title>
</head>
<body>
    	<!-- 准备好一个“容器” -->
	<div id="test"></div>
	
	<!-- 引入react核心库 -->
	<script type="text/javascript" src="../js/react.development.js"></script>
	<!-- 引入react-dom，用于支持react操作DOM -->
	<script type="text/javascript" src="../js/react-dom.development.js"></script>
	<!-- 引入babel，用于将jsx转为js -->
	<script type="text/javascript" src="../js/babel.min.js"></script>

    <script type="text/babel">
        // 创建组件

        

        class Login extends React.Component{

            state={
                username:'',
                password:''
            }
            // 用户名的回调函数
            saveUsername = (event) => {
                this.setState({username:event.target.value})
            }

            savePassword = (event) => {
                this.setState({password:event.target.value})
            }

            handleSubmit = (event) => {
                event.preventDefault();
                const {username,password}=this.state
                alert(`我的用户名是${username},我的密码是${password}`)
            }



            render() {
                
                return (
                   <form onSubmit={this.handleSubmit}>
                      用户名: <input onChange={this.saveUsername} type="text"  name="username"/>
                        <br/>
                        密&nbsp;&nbsp;&nbsp;码: <input  onChange={this.savePassword} type="password"  name="password"/>
                        <br/>
                        <button>登录</button>
                    </form>
                )
            }
        }
        ReactDOM.render(<Login />, document.getElementById('test'))
    </script>
    
</body>
</html>